Spacer – Sprocket Side (Rear Wheel) for Bullet 500 Euro 4 / Classic 500 Euro 4 – 594051/B (Replaces 594051/A)

Product Description 

Royal Enfield 594051/B is the rear wheel spacer – sprocket side (chain side). This small but critical OEM spacer sits on the sprocket/chain side of the rear axle assembly and maintains correct wheel alignment, sprocket carrier spacing, and bearing load positioning. If the wrong spacer is fitted (or the original is worn, missing, or damaged after bearing work), you can get chain line offset, abnormal bearing wear, uneven wheel alignment, and repeat failures soon after service.

This part is also searched as rear wheel spacer, sprocket-side spacer, chain side wheel spacer, rear axle spacer, wheel distance piece. OEM fit matters here because the thickness/shoulder is what sets the axle stack-up—mixing spacers from other platforms can create side-load on bearings and misalign the wheel.

Before you buy: confirm your bike’s exact variant/market (Euro 4/BS4 UCE 500 family) via VIN or rear wheel assembly diagram, or share photos of your existing spacer + rear axle stack before dispatch.

Key Features

• Genuine Royal Enfield OEM spacer – correct thickness & shoulder for factory axle stack-up
• Position: rear wheel, sprocket/chain side (not disc side)
• Helps maintain correct chain line and rear wheel alignment
• Prevents bearing side-loading caused by incorrect spacing
• Used during rear wheel bearing, sprocket carrier, or cush rubber service
• Supersession: 594051/B replaces 594051/A
• Small part, big impact on reliability and return prevention

Compatibility Table 

*Years are indicative because Royal Enfield variants overlap by market. Always confirm by VIN / rear wheel assembly diagram.

Variants

No variants.

FAQs

Q1 (Fitment): How do I confirm 594051/B is the correct spacer for my bike?
Confirm (1) your model/platform is within the Euro 4/BS4 UCE 500 family, (2) your rear wheel assembly diagram/VIN search shows 594051/B, and (3) your removed spacer matches the same position (sprocket/chain side) and dimensions. If unsure, share a photo of the rear axle stack/spacer next to a scale before dispatch.

Q2 (Fitment): Will this fit BS3 UCE 500 or older AVL/Carb models?
Do not assume. Royal Enfield used different axle/spacer stacks across years and markets. If your catalogue shows 594051/A, this is typically superseded to 594051/B—but confirm via VIN/diagram before ordering.

Q3 (Comparison): 594051/A vs 594051/B—what changed?
594051/B is the current replacement/supersession for 594051/A in Royal Enfield’s parts systems. When your model lists 594051/A, ordering 594051/B is usually correct as the updated supply reference—verify with your VIN if you want zero-risk.

Q4 (Installation): Any precautions while installing this spacer?
Clean the axle and spacer seats, lightly grease the axle, ensure the spacer sits flush (no burrs), and tighten axle torque as per service manual. After installation, check wheel free rotation, chain alignment, and rear brake function.

Q5 (Symptoms): What problems does a wrong/missing sprocket-side spacer cause?
Rear wheel misalignment, chain running off-line, abnormal sprocket/cush wear, premature bearing failure, wheel side-play, and uneven rear tyre wear—especially soon after a bearing/sprocket job.

Q6 (Returns-prevention): What should I send you to confirm before shipping?
Send (1) your VIN (last 6 digits okay), (2) a clear photo of your rear wheel/axle area during removal (showing spacer position), and (3) your bike’s exact model + year/market. This prevents wrong-platform spacer orders.